From 41fb7d649d3de7ad9a77d7e37cfc02014ae177a7 Mon Sep 17 00:00:00 2001
From: Aokromes <aokromes@gmail.com>
Date: Thu, 9 Jun 2016 07:51:34 +0200
Subject: [PATCH] Fix pch run

---
 cmake/macros/FindPCHSupport.cmake | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/cmake/macros/FindPCHSupport.cmake b/cmake/macros/FindPCHSupport.cmake
index 6edc8e92890..290789f43a0 100644
--- a/cmake/macros/FindPCHSupport.cmake
+++ b/cmake/macros/FindPCHSupport.cmake
@@ -26,8 +26,15 @@ FUNCTION(GET_COMMON_PCH_PARAMS TARGET_NAME_LIST PCH_HEADER PCH_FE INCLUDE_PREFIX
     CollectIncludes(${TARGET_NAME} TARGET_INCLUDES TARGET_DEFINITIONS)
   ENDFOREACH()
 
-  LIST(REMOVE_DUPLICATES TARGET_INCLUDES)
-  LIST(REMOVE_DUPLICATES TARGET_DEFINITIONS)
+    IF (PARENT_PACKAGE_INCLUDE_DIRS)
+      LIST(REMOVE_DUPLICATES TARGET_INCLUDES)
+    ENDIF()
+    IF (PARENT_PACKAGE_LIBRARY_DIRS)
+      LIST(REMOVE_DUPLICATES TARGET_DEFINITIONS)
+    ENDIF()
+    # NOTE: Above, in the rare case that none of the subpackages contain any
+    # libraries or any include directories, we need to not call
+    # LIST(REMOVE_DUPLICATES ...).
 
   FOREACH(ITEM ${TARGET_INCLUDES})
     LIST(APPEND INCLUDE_FLAGS_LIST "${INCLUDE_PREFIX}\"${ITEM}\" ")